Overview
The New Year (新年, shinnen) is the day that marks the time of the beginning of a new calendar year, and is the day on which the year count of the specific calendar used is incremented. For many cultures, the event is celebrated in some manner.
NewYear or newyear is a pixiv tag for the New Year.
Due to pixiv tags not having spaces it can be hard to write a tag in English. Some users have resorted to getting rid of the spaces and combining the whole tile together.
For more details refer to the article New Year.